The duo also is charged with wounding Avery's older children, a 5-year-old girl and an 8-year-old boy.

The court has sought psychiatric evaluations of both defendants. Friday, a psychiatric facility that examined Sanford submitted a report to court that said Sanford could not be held criminally responsible for her actions.

Prosecutors Ask for Psychiatric Exams in Child Exorcism Deaths

Avery and Sanford told investigators that they believed evil spirits jumped between the bodies of the children and that they needed to perform an exorcism to drive the demons out, said Montgomery County State's Attorney John McCarthy earlier this year.

When being questioned by police, the women told investigators that they tried multiple methods to remove the presence of demons from the children, progressing from attempting to break the neck of the youngest child, to strangulation, to stabbing.